git.rot13.org Git - goodfet/blob - firmware/goodfet.c

   1 /*! \file goodfet.c
   2   \author Travis Goodspeed
   3   \brief Main module.
   4
   5   This is the main module of the GoodFET, which calls the initialization
   6   routines and delegates commands to the various applications.
   7 */
   8
   9
  10 #include "platform.h"
  11 #include "command.h"
  12 #include "apps.h"
  13 #include "glitch.h"
  14
  15 #if (platform == tilaunchpad)
  16 #include <setjmp.h>
  17 jmp_buf warmstart;
  18 void coldstart();
  19 #include "msp430_serial.h"
  20 #endif
  21
  22 #define RESET 0x80      // not a real app -- causes firmware to reset
  23 #define DEBUGAPP 0xFF
  24
  25 //! General init function, calls platform-specific one.
  26 void init(){
  27 #ifdef MSP430
  28   #define INITCHIP msp430_init();
  29 #endif
  30
  31 #ifdef ARDUINO
  32   #define INITCHIP arduino_init();
  33 #endif
  34
  35 #ifdef INITCHIP
  36 INITCHIP
  37 #else
  38 #warning "No init() routine for this platform!"
  39 #endif
  40
  41 #ifdef INITPLATFORM
  42   INITPLATFORM
  43 #endif
  44 }
  45
  46
  47
  48 //! Handle a command.
  49 void handle(uint8_t const app,
  50             uint8_t const verb,
  51             uint32_t const len){
  52   int i;
  53
  54   //debugstr("GoodFET");
  55   led_off();
  56
  57   // find the app and call the handle fn
  58   for(i = 0; i < num_apps; i++){
  59     if(apps[i]->app == app){
  60       // call the app's handle fn
  61       (*(apps[i]->handle))(app, verb, len);
  62
  63       // exit early
  64       return;
  65     }
  66   }
  67
  68   // if we get here, then the desired app is not copiled in
  69   // this firmware
  70   debugstr("App missing.");
  71   debughex(app);
  72   txdata(app, NOK, 0);
  73 }
  74
  75
  76 //! Main loop.
  77 int main(void)
  78 {
  79         volatile unsigned int i;
  80         unsigned char app, verb;
  81         unsigned long len;
  82         // MSP reboot count for reset input & reboot function located at 0xFFFE
  83         volatile unsigned int reset_count = 0;
  84 #if (platform == tilaunchpad)
  85         int ret=0;
  86
  87         //ret = setjmp(warmstart);// needs to be here since context from init() would be gone
  88  warmstart:
  89         if (ret == 0) {
  90                 coldstart();    // basic hardware setup, clock to TUSB3410, and enable
  91         } else if (ret == 2) {
  92                 dputs("\nalmost BSL only one RTS change\n");
  93         } else if (ret > 2) {   // reset released after more than two tst transisitions
  94                 // We could write a BSL, a nice exercise for a Sunday afternoon.
  95                 dputs("\nBSL\n");
  96                 //call_BSL();   // once you are done uncomment ;-)
  97         } else {                // we come here after DTR high (release reset)
  98                 dputs("\nWarmstart\n");
  99         }
 100 #else
 101         void (*reboot_function)(void) = (void *) 0xFFFE;
 102 #endif
 103         init();
 104
 105         txstring(MONITOR,OK,"http://goodfet.sf.net/");
 106         //txstring(0xab,0xcd,"http://goodfet.sf.net/");
 107
 108
 109         //Command loop.  There's no end!
 110         while(1)
 111         {
 112                 //Magic 3
 113                 app = serial_rx();
 114
 115                 // If the app is the reset byte (0x80) increment and loop
 116                 if (app == RESET)
 117                 {
 118                         reset_count++;
 119
 120                         if (reset_count > 4)
 121                         {
 122                                 // We could trigger the WDT with either:
 123                                 // WDTCTL = 0;
 124                                 // or
 125                                 // WDTCTL = WDTPW + WDTCNTCL + WDTSSEL + 0x00;
 126                                 // but instead we'll jump to our reboot function pointer
 127                           #ifdef MSP430
 128 #if (platform == tilaunchpad)
 129                                 // do we really need this, we do not want to reset the TUSB3410
 130                                 dputs("reset_count>4\n");
 131
 132                                 //longjmp(warmstart,111);
 133                                 goto warmstart;
 134
 135 #else
 136                                 (*reboot_function)();
 137 #endif
 138                           #else
 139                                 debugstr("Rebooting not supported on this platform.");
 140                           #endif
 141                         }
 142
 143                         continue;
 144                 }
 145                 else
 146                 {
 147                         reset_count = 0;
 148                 }
 149
 150                 verb = serial_rx();
 151                 len = rxword();
 152
 153                 //Read data, looking for buffer overflow.
 154                 if(len <= CMDDATALEN)
 155                 {
 156                         for(i = 0; i < len; i++)
 157                         {
 158                                 cmddata[i] = serial_rx();
 159                         }
 160
 161                         handle(app,verb,len);
 162                 }
 163                 else
 164                 {
 165                         //Listen to the blaberring.
 166                         for(i = 0; i < len; i++)
 167                                 serial_rx();
 168
 169                         //Reply with an error.
 170                         debugstr("Buffer length exceeded.");
 171                         txdata(MONITOR,NOK,0);
 172                 }
 173         }
 174 }
 175